Drill chuck



A.' E. RINEER Dec. s, 1938.

DRILL CHUCK Filed Sept. 15, 1957 Patented Dec. 6, 1938 V UNITED STATES PATENT OFFICE 2,139,421 DRILL onUoK Arthur E. Rineer, Dayton, Ohio Application September 15, 1937, Serial No. 163,992 1 Claim. (01. 279-62) This invention relates to a chuck for a drill one side of the key ring may be utilized to tighten press and more particularly to the key ring for the gripper jaws and the other set of gear teeth tightening and loosening the gripper jaws; disposed on the opposite side of the key ring may A key ring for tightening and loosening the be used when releasing the gripper jaws.

gripper jaws of a chuck having gear teeth along The chuck body I is provided with a pair of 5 one side thereof to be actuated by a key having cylindrical portions or extensions l2 and i4, one a small pinion meshing with the gear teeth is above and one below the cylindrical or tubular old, as shown in the patent to Jacobs No. 709,014 key ring I 6. The body ID has a plurality of dated Sept. 16, 1902. There is a tendency, and diagonally disposed recesses 20, each supporting a very marked tendency, for the key to slip outa gripper jaw 22, provided with inclined teeth 24, 10 Wardly out of engagement with the teeth and to meshing with the threads 26 found on a collar become worn, due to the key coming partially or nut 28, suitably attached to the key ring l5. out of its socket. As a result of this, the key The mechanism described thus far is broadly old, ring must be replaced at frequent intervals. It excepting the shape of the body and the key ring. has been proposed to use spiral teeth, or inclined The key ring 16 is provided with two sets of 15 teeth, so as to cause a coaction between the teeth gear teeth, one indicated by reference character on the key and the teeth on the key ring to cause 30 and the other by reference character 32. the key to be drawn into the socket. This has These gear teeth are inclined, the gear teeth 3t been found to give excellent results when tightbeing inclined in one direction and the gear teeth 20 ening the gripper jaws; but when it comes to 32 being inclined in theopposite direction, when 20 loosening the gripper jaws the inclined teeth tend viewed from the same side. to pull the key outwardly, which completely de- The key ring I6 is rotated upon the body porfeats the purpose of the inclined teeth. With tion In either manually or by the key 34 having this arrangement it is very easy to tighten the the end portion 38 seated in a selected socket, gripper jaws; but exceedingly difficult to loosen either 40 or 42. For most purposes the key 34 25 them. is absolutely essential to obtain a sufiicient firm An object of this invention is to provide ingrip on the drill or whatever other tool is used. clined gear teeth on opposite ends of the key ring, Let it be assumed that the gear teeth are best so that one set of gear teeth may be used when suited to tighten the gripper jaws 22 and the 30 tightening the gripper jaws, the other set of gear gear teeth 32 adapted to best release the gripper 30 teeth to be used when releasing the gripper jaws. jaws. By positioning the key in one of the sock- Another object of this invention is to provide ets in the extension l2 the gripper jaws may be an attachment for chucks now in use, so as to tightened very effectively by rotating the key 34 add a second set of gear teeth to be used when which drives the key ring l6 actuating the nut 35 releasing the gripper jaws. 28. 35

Other objects and advantages reside in the In loosening the gripper jaws, the key 34 is construction of parts, the combination thereof preferably inserted into the socket 42 in the and. the mode of operation as will become more cylindrical portion l4, so as to cause the key 34 apparent from the following description. to effectively engage the gear teeth 32 to loosen In the drawing, Fig. 1 shows a side view of a the gripper jaws. The reverse inclination of the 40 chuck. gear teeth on opposite ends of the key ring per- Fig. 2 is a cross sectional view taken substanmits the use of the same tool for effectively tially on the section line 2-2 of Fig. 1. tightening the key ring when using one set of Fig. 3 shows a sectional view of a modification. gear teeth and for loosening the key ring when 45 Fig. 4 shows an end view disclosing the inclined using the other set of gear teeth. Thereby the 45 teeth. gripper jaws may be either tightened or loosened Fig. 5 shows a modification utilizing an attachwith equal ease. The key 34 is rotated in the ment for conventional chucks now in use. same direction both when tightening the gripper Fig. 6 is across sectional view taken on the line jaws and when releasing same. 66 of Fig. 5. In the modification disclosed in Fig. 3, the body 50 The chuck disclosed herein utilizes a convenportion 50 is provided with cylindrical portions tional chuck structure with the exception of the 52 and 54 extending beyond the key ring 66. The key ring which has been provided with two sets diameter of the cylindrical portion 52 adjacent of inclined gear teeth, inclined in opposite directhe gripper jaws is less than the diameter of the 55 tions, so that one set of gear teeth located on cylindrical portion 54. As the working parts of 55 the chuck shown in Fig. 3 are much the same as those shown in Figs. 1 and 2, these parts will not be described in detail. The key ring 86 is provided with a shoulder 68 which necessitates inserting the key ring upon the body from the gripper jaw end thereof. This gives rise to the necessity for using cylindrical portions 52 and 54 of difierent diameters;

The gear teeth 10 found on the lower end of the key ring 66, as shown in Fig. 3, are inclined in one direction, much the same as the inclination of the gear teeth described in connection with the embodiment shown in Figs. 1 and 2. The upper end of the key ring 66 is provided with a shoulder or enlargement 12, which forms the support for the gear teeth 14. In this modification, due to the greater diameter of the key ring at the upper end, as compared to the lower end, it is necessary to have a greater number of gear teeth on the upper end than on the lower end. The key ring 66 may be tightened by inserting the end 38 of the key 34 into the socket I6. This key ring may easily be loosened by inserting the end 38 into the socket 18. Due to the inclination of the teeth the key will automatically properly seat itself and tend to work into the gear teeth.

In the modification disclosed in Figs. 5 and 6 an attachment has been shown that may be used with chucks now appearing on the market and now in use, so as to convert the chucks into chucks having a double set of gear teeth. This attachment includes a gear ring press fitted, welded or threadedly engaging the conventional key ring 82 on standard chucks. The teeth 84 on the gear ring 80 are inclined in a direction opposite to the inclination of the gear teeth 86 found on the conventional key ring 82. A collar 90 is attached to the arbor 94 of the drill press and provides suitable sockets 92, adapted to receive the end 38 of the key 34. The collar 90 is preferably split at 96 and tightened upon the arbor 94 by means of a suitable screw 98.

When tightening the key ring 82, so as to tighten the gripper jaws, the key 34 is preferably inserted into the socket I00 adapted for use with the gear teeth 86. Chucks now in use are provided with inclined gear teeth which are very effective in tightening the chuck; but very ineflicient when it comes to loosening the chuck. The attachment including the gear ring 88 and the collar 90 expedites the release of the gripper jaws, in that the key 34 may then be used to loosen the key ring 82 and thereby release the gripper jaws.

Although the preferred modification of the device has been described, it will be understood that within the purview of this invention various changes may be made in the form, details, proportion and arrangement of parts which generally stated, consist in a device capable of carrying out the objects set forth, in the novel parts, combination of parts and mode of operation, as disclosed and defined in the appended claim.

Having thus described my invention, I claim:

In a drill press chuck adapted for use with a key having a pinion provided with inclined gear teeth, the combination including a body portion and a key ring portion, the body portion having key receiving sockets on both sides of the key ring, the opposite sides of said ring having inclined gear teeth, the gear teeth on one side being oppositely inclined with respect to the gear teeth on the other side so that the key when inserted in one of the sockets on one side of the key ring will effectively tighten the gripper jaws of the chuck and when inserted in the socket on the other side of the key ring will effectively loosen the key ring, thereby releasing the gripper jaws.

ARTHUR E. RINEER. 

